Clock



FIG. 1 is a front perspective view showing the new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a side elevation view thereof, the side opposite that shown in FIG. 4 being the mirror image thereof;

FIG. 5 is a rear elevation view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line showings throughtout the views are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a clock, as shown and described. 